hi i have a typescript program that gives the user a list of numbers then the user inputs the number that is trying to find and the program is going to tell the user the location of the number , the program works fine but the only problem is the try and catch when i input a string it should say "input an integer" but it doenot do that how can i fix it?

code:

	import * as readline from 'readline'
	function compareNumbers (a: number, b: number) {
	// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/sort
	return a - b
	}
	function getRandomInt (min: number, max: number) {
	// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/random
	min = Math.ceil(min)
	max = Math.floor(max)
	return Math.floor(Math.random() * (max - min) + min)
	}
	function binarySearch (array: number[], searchNum: number,
	lowIndex: number, highIndex: number) {
	// this function is a binary search engine.
	if (lowIndex > highIndex) {
	return -1
	} else {
	const medium: number = Math.round((highIndex + lowIndex) / 2)
	let returnValue: number
	if (array[medium] > searchNum) {
	returnValue = binarySearch(array, searchNum,
	lowIndex, medium - 1)
	return returnValue
	} else if (array[medium] < searchNum) {
	returnValue = binarySearch(array, searchNum,
	medium + 1, highIndex)
	return returnValue
	} else {
	return medium
	}
	}
	}
	const generatedNum :number[] = new Array(250)
	for (let i: number = 0; i < generatedNum.length; i++) {
	generatedNum[i] = getRandomInt(0, 1000)
	}
	generatedNum.sort(compareNumbers)
	console.log(generatedNum)
	const rl = readline.createInterface({
	input: process.stdin,
	output: process.stdout
	})
	rl.question(
	'What number are you searching for in the array (integer between 0 and 999): '
	, function (input) {
	try {
	const answer: number = binarySearch(generatedNum, parseInt(input), 0, 250)
	if (answer === -1) {
	console.log('The number is not present in the array.')
	} else {
	console.log('The number is present at index ' + answer + '.')
	}
	} catch (exeption) {
	console.log('please insert an integer.')
	}
	rl.close()
	console.log(' Done.')
	})